1 Department of Hepatobiliary and Pancreatic Surgery, The Affiliated Hospital of Yunnan University, The Second People's Hospital of Yunnan Province, No 176 Qingnian Road, Wuhua District, Kunming, Yunnan Province, China.
2 The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China.
3 Department of Hepatobiliary and Pancreatic Surgery, The Affiliated Hospital of Yunnan University, The Second People's Hospital of Yunnan Province, No 176 Qingnian Road, Wuhua District, Kunming, Yunnan Province, China. Electronic address: xsrsyby@sohu.com.